simultaneously

Etymology

simultaneous + -ly

adv

1. Occurring at the same time.
   The cradle-rocking and the song would cease simultaneously for a moment, and an exclamation at highest vocal pitch would take the place of the melody. 1891, Thomas Hardy, Tess of the d'Urbervilles, volume 1, London: James R. Osgood, McIlvaine and Co., page 29
   Hidden behind thickets of acronyms and gorse bushes of detail, a new great game is under way across the globe. Some call it geoeconomics, but it's geopolitics too. The current power play consists of an extraordinary range of countries simultaneously sitting down to negotiate big free trade and investment agreements. 2013-07-19, Timothy Garton Ash, “Where Dr Pangloss meets Machiavelli”, in The Guardian Weekly, volume 189, number 6, page 18